std::string filePath = std::string([path UTF8String]);
auto player = rlottie::Animation::loadFromFile(filePath);

size_t w = 400;
size_t h = 400;

auto animationBuffer = std::unique_ptr<uint32_t[]>(new uint32_t[w * h]);
rlottie::Surface surface(animationBuffer.get(), w, h, w * 4);

player->renderSync(0, surface);

NSMutableData *data = [[NSMutableData alloc] initWithLength:w * (h * 2) * 4 + w * h + w * h * 4];
memset((uint8_t *)data.bytes + w * h * 2 * 4, 255, w * h);

vImage_Buffer plainBuffer;
plainBuffer.width = w;
plainBuffer.height = h;
plainBuffer.rowBytes = w;
plainBuffer.data = (uint8_t *)data.bytes + w * h * 2 * 4;

vImage_Buffer inputBuffer;
inputBuffer.width = w;
inputBuffer.height = h;
inputBuffer.rowBytes = w * 4;
inputBuffer.data = (uint8_t *)data.bytes;
memcpy(inputBuffer.data, (void *)animationBuffer.get(), w * h * 4);

vImage_Buffer alphaSingleBuffer;
alphaSingleBuffer.width = w;
alphaSingleBuffer.height = h;
alphaSingleBuffer.rowBytes = w;
alphaSingleBuffer.data = (uint8_t *)data.bytes + w * h * 2 * 4 + w * h;
vImageExtractChannel_ARGB8888(&inputBuffer, &alphaSingleBuffer, 3, kvImageNoFlags);

vImage_Buffer alphaBuffer;
alphaBuffer.width = w;
alphaBuffer.height = h;
alphaBuffer.rowBytes = w * 4;
alphaBuffer.data = (uint8_t *)data.bytes + w * h * 4;

vImage_Error err = vImageConvert_Planar8toARGB8888(&alphaSingleBuffer, &alphaSingleBuffer, &alphaSingleBuffer, &plainBuffer, &alphaBuffer, kvImageNoFlags);

vImageUnpremultiplyData_RGBA8888(&inputBuffer, &inputBuffer, kvImageNoFlags);
err = vImageOverwriteChannels_ARGB8888(&plainBuffer, &inputBuffer, &inputBuffer, 0x1, kvImageNoFlags);

CGDataProviderRef dataProvider = CGDataProviderCreateWithCFData((__bridge CFDataRef)data);
CGImageRef imageRef = CGImageCreate(w, h * 2, 8, 32, w * 4, CGColorSpaceCreateDeviceRGB(), kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst, dataProvider, NULL, false, kCGRenderingIntentDefault);